Similarly to how we previously removed 

state { 0 }

 composable and now promote usage like 

remember { mutableStateOf(0) }

 we are going to remove 

savedInstanceState { 0 }

 composable. You should use 

rememberSaveable { mutableStateOf(0) }

 instead and it will save and restore automatically if the type used inside the MutableState can be stored in the Bundle. If previously you were passing a custom saver object now you need to use a new overload of rememberSaveable which has 

stateSaver

 parameter. The usage will look like this: 

val holder = rememberSaveable(stateSaver = HolderSaver) { mutableStateOf(Holder(0)) }